Definition
An SAP application server has to process SAP requests from multiple front ends. The application server has the use of a dispatcher, which gathers the requests and transfers them for processing to the work processes. The work processes then execute the desired requests (for example, an ABAP program).

Use
Here are the following types of work processes:

Work Process Type

Use

Dialog

Executes dialog programs (ABAP)

Update

Asynchronous database changes (is controlled by a COMMIT WORK statement in a dialog work process)

Background

Executes time-dependent or event-controlled background jobs

Enqueue

Executes locking operations (if SAP transactions have to synchronize themselves)

Spool

Print formatting (to printer, file or database)

Several dialog work processes usually run on one application server. There are usually only one or two other types of work process.

Structure
A work process consists of a screen processor, the ABAP interpreter, the database interface and the task handler that calls these programs.

Integration
The dispatcher is the central process of the application server. After it has been started, it generates the work process. You can configure the number of different types of work process that run on an application server.

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